模具钢增材制造及其性能的研究进展

随形冷却模具一般具有复杂的异形流道,能够大大提高冷却效率和产品的表面质量,但是其加工难度非常大.增材制造是一种通过逐层累加实现构件成形的技术,其优势是能实现材料的内部复杂结构.粉末的制备是增材制造的基础也是关键步骤,粉末质量的高低一定程度上决定了增材件的好坏,常见的模具钢粉末制备方法有气雾化法和等离子旋转电极雾化法.增...

Research progress in additive manufacturing and properties of die steel

The conformal cooling mold generally has complex special-shaped flow channels, which can greatly improve the cooling efficiency and the surface quality of product, but its processing is very difficult. Additive manufacturing is a technology to realize component forming layer by layer, and its advantage is to realize the internal complex structure of materials. The manufacturing of powder is the basis and key step for additive manufacturing, the quality of powder is determining the quality of additive parts to a certain extent. The gas atomization and plasma rotating electrode process are two common methods for preparing mold steel powder. During the additive manufacturing, the material is always undergoing quickly melted and solidfied, and also goes through the thermal cycle between layers with non-equilibrium solidification microstructure, which is different from the casting state, and the properties are also different from the traditional parent material with the same composition. The tensile strength and yield strength of die steel by additive manufacturing are generally higher than those of as-cast and lower than those of rolled or solution-aged base materials, and the plasticity is generally difficult to meet the requirements of use. The process, microstructure and properties of powder preparation and properties of typical die steel are reviewed in order to provide reference for the in-depth study of additive manufacturing die steel.